thoughts please. which would be best to use on a max wedge [original] intake ? plan is to install engine with single four intake, maximize tune, then down the road, install the cross ram.
using a sniper or fitech throttle body to start with, it will already have the fuel system in place for the dual throttle bodies.
engine combo will stay the same, just an intake change. i know there will be a probable HP loss over the single TB, correct ?
446ci, 10.9:1cr, 256@ .050, .600lift, 4kstall, 4.10 gear, 3950lbs
is this a waste of time, or a somewhat doable plan ? as always, TIA !

Can't advise on your question, but TB may not distribute fuel the same way as carbs.

I don't think you will loose power by going to two TBI on a stock type M.W. intake and heads, on a set of stock port size 440 heads with the same type and proper size intake port manifold, maybe you will
The tuning might be challenging though
I've race and driven several different stock type M.W. motors in several different cars, they where all faster than any single carb car out there back in the day, prior to 2000 More air and fuel, more power

Most people would not be able to make that combination work so be prepared for some challenges and you might need some professional help to finish it off.

I have tuned a couple of efi projects and I will mention somthing many seem to not get right away. When intake air/fuel distribution is good with a carb, its generally good with an efi system. Just like carbed systems, efi gains from good intake air and fuel flow. I know this because I have run a couple systems and then changed or modded the intake and performance improved.

What efi does that a carb does not, is atomize the fuel better. Smaller droplets, but at a higher pressure. So you may have to tinker with the intake and spacers and porting. Generally any porting that benefits a carb will benefit and efi system. Efi generally likes a single plane style intake plenum best. With the higher fuel pressure the droplets come out at, they find less obstructions in the intake with a open plenum and its therefore pretty responsive.

For dual plan intakes, I found cutting/thinning the divider way down and using an open 1" spacer really helped on one of my projects. And just like a carbed system, I was pulling all 8 plugs to see what they all looked like after a run. When its right, they will all be very similar in color....

Generally, tuning a finicky intake/cam with efi, a good Idle is the toughest thing to get right. Once that's good, life gets better.

Me, I would try it....Nothing on your end seems too radical with your setup. Call each company and interview someone who knows their product and then decide which would work best. I like the self learning feature....Never want another efi without it.

I used to run a 431&484 cube Hemi with a 2100cfm tunnel ram with bug catcher efi on the street...Cam was no fun with that much air flow on tap...

What efi does that a carb does not, is atomize the fuel better

Higher fuel vapor content replaces air in the charge mass.

oh, i need professional help alright !!

i am well prepared for challenges, as i have always been slightly "off the beaten path".
it will also require help from someone who knows their way around a laptop.

something i noticed, in the duel throttle body kits, FITECH offers one TB that contains the computer setup, with the other being a slave-type, running off the computer on the other TB.
the Sniper system doesn't seem to offer this.
any thoughts how this would work ? that, to me, would seem to be a somewhat easier setup to get going using the single 4 intake, then piggyback the second TB when the intake change is made.

my first [and only] fuel injection swap was done installing a 95 camero LT1 in my buddy's 55 chevy, about 15yrs ago. many hairs were lost over that deal, even using a conversion harness.
about 877 phone calls to the harness maker, and a 95 cadillac FSM for the wiring schematics and trouble code diagnostics, we were awarded great driveability and 27+mpg. [not expecting 9 with this deal, but that would be nice. ]

and self-learning is a must for sure !

FastManEFI... Rich on here is a great resource for the Holley and FAST side of efi....Check out his website. He is great to deal with and very helpful.

thanks ! i was thinking of him, but couldn't recall his name. ["oldtimers" ya know.....]

I (vaguely) remember the GM "crossfire" dual TBI system in the mid 80's. It wasn't good, Get the system that has the most tuning range and plan on some dyno time.

A friend of mine who runs a 588 cube chevy put on the FITECH tb that is suppose to work up to 1200 horse power. His is 1100 + . I was amazed on how the car started and ran as it was a 15 to 1 compression engine. Hit the starter switch and it ran like a new car. The problem with FITECH is their biggest tb will only flow 850 CFM. This is a race car and changing from a mechanical injected toilet the car ran out of air and slowed down 3 tenths in the quarter. It went from 8.7 to 9.0 But it ran the number re-peatably each run. So his thinking was to add another tb . Wouldn't we all think that? Bought a tunnel ram and another duplicate 1200 hp tb with the computer. BIG MISTAKE!! In the first place he didn't understand that each tb computer was trying to run the 588 cube engine.The car slowed down almost 1 second by adding the second tb. He's the only guy I know that can spend $3000 bucks on parts to slow his car down. The computer in the tb can be fooled into thinking it's controlling a different size engine and that was tried with mixed results. No consistency. In the end the extra fuel washed down the cylinders and the new engine needed rings . Myself reading about racing and the problems on launch is that the computer in the tb can not react as fast as a carburetor , but after the initial launch it will be the same performance. So my 2 cents would say and that is just my opinion , if you got the extra $1500 bucks or $3000 plus the cost of the cross ram intake give it a try. But be prepared to pay the consequences if you aren't computer savvy.

All I can tell you is we put this Holley Sniper EFI on my sons Dart and he really likes it. So far the car has slowed down a bit as its run 11.60's so far on the EFI and it ran 11.40's with a 750 DP. But we are still tuning it and the car itself runs great as its just slowed a tad which many said it would. The driveability is awesome and my son says he wont go back to a carb. Ron

rowin, you bring up a good point about the conflicting computers in dual setups, that's why i mentioned the FITECH dual setup having the computer in the one TB, with the second TB controlled by the first as a sort of slave unit. i didn't see anything like that offered with the Sniper setups, but i may have missed it.
i'm trying to learn all i can before plunking down a bunch of bucks, by asking lots of dumb questions, and scouring out any and all experience with this stuff first.
i will go back and visit the dual TB setup[s] to see what CFM each TB is capable of.
the crossram has been on the shelf for 30yrs or so.

I believe Rich has done dual throttle bodies on a hemi crossram. That's who I would call for advise.

he is on the list for sure ! i hope he has a good phone ear. i know i'm probably going to be one of his "top dunce" student candidates.

I had Rich tuned a dual dry throttle body Holley Terminator EFI set up on one of my customers 572C.I. pump gas street hemi, it has the Stage V single plane intake with direct port injections, not wet throttle bodies. We dyno tuned it only, the car is all apart now waiting for paint ,body, interior and final assembly
I have a friend who swears by the Fitech set ups, he builds a lot more cars (not just Mopars ) than I do, he is struggling with using them with dual TBI also

Holley has a dual quad Sniper out now.

Sniper EFI 2X4 4150

thanks ghost !
one thing for sure, i'm going to enroll in rich's on-line class ! hope it doesn't take me the typical 4yrs to complete like going to college........

I've been reading up on both the Fitech and Holley Snipers on various forums for awhile now. I even talked to a guy running a Fitech at the local car show today. From what I keep hearing and reading the Holley Sniper is just overall a little bit better setup. I even heard that from the Fitech owner. Also from what I've heard, Holley has much better tech support. If you decide on the Holley Sniper, here's a couple of great tech forums to check out. https://www.facebook.com/groups/SniperEFISupport/
https://forums.holley.com/ Holley also sells reproduction gas tanks that are baffled and setup for internal fuel pumps if you want to go that route. I'm planning on running two Holley Snipers on a tunnel rammed 493 stroker.

If your not stuck on either of those....I will throw another possibility at you....I ran a signle quad setup and it was awesome....I can tell you it works very well on the self learning. And Rich is a big helpo if you get stuck on somthing,

https://www.rodauthority.com/tech-s...-dual-quad-efi-system-on-a-65-belvedere/